Open-hearth furnace



May 12, 1936. L. c. EDGAR OPEN HEARTH FURNACE Filed Sept. 27, 1934 2 Sheets-Sheet 2 Patented May 12, 1936 I UNITED STATES PATENT OFFICE OPEN-HEARTH FURNACE Louis C. Edgar, Swissvale, Pa.

Application September 27, 1934, Serial No. '745,825

2 Claims. (Cl. 263-15) This invention relates to open-hearth furnaces, the gas and air are thus burned in a localized area, one of the objects being to construct an openthere is little danger of the flame reaching the hearth so as to confine the heating ame to the roof. Furthermore, the converging shapes of the surface of the bath and keep it away from the arches and B tend to downwardly direct the re- 5 roof. Other objects may be inferred. sulting ow of intermixed air and fuel much more 5 In the accompanying drawings: effectively than can be done only by the declina- Figure 1 is a horizontal section of a side of a tion of the nozzle 4 and port 2.

furnace to which the invention is applied; The arches 5 and 6 are made of any suitable Figure 2 is a vertical section of the same; refractory and have hollow walls. Pipes 'l and 8 Figure 3I is a cross-section taken from the line serve to introduce cooling fluid to the hollow Walls 10 III-III in Figure 2; of these arches.

Figure 4 is a cross-section taken from the line In addition to functioning as inspirators when IV-IV in Figure 2. this side of the furnace is on heat, these arches This furnace includes the usual hearth I 5 and 6 function as bafes when the other side of l5 which carries the metal bath, a port 2 which the furnace is on heat and the products of coml5 alternately functions to discharge fuel and air bustion are discharging through the port 2. Beover the bath and to remove the products of comcause of their conical shape, their baing action bustion, an up-and-doWn-take 3 Vfrom which the is such as to smooth out the gaseous flow and thus port 2 opens,` and a nozzle 4 which points through prevent or at least diminish the pocketingreffects the port 2 toward the hearth. caused by the shape of the port 2 and its abrupt 20 When this side of the furnace is on heat, heated right angular turn at the up-and-down-take 3. air is blown through the up-and-down-take 3 and I claim: a flow of fuel is discharged from the nozzle 4 1. An open-hearth furnace including the comthrough the port 2. Both the port and the nozzle bnation of a port, an up-and-down-take from are arranged at a downward angle in the hope which said port opens, a fuel nozzle pointing 25 that this will throw the llame against the bath through said port toward the hearth of said furand away from the roof of the furnace. This renace, and at least one upright conical arch that sult is usually not obtained for the reason that is arranged in said port so that it is spaced from combustion does not occur directly at the openthe walls and top of the latter and is centered ing of the port, the llame playing about in the over the center line of said nozzle, said arch con- 30 furnace in a more or less haphazard manner. verging in the discharging direction of said noz- In the case of the furnace being described, two zle lahd having an open bottom that faces said upright conical arches 5 and 6 are arranged in up-and-down-take and is at least mainly in line the port 2 so that they are spaced from the Walls therewith.

and top of the latter and are centered over the 2. An open-hearth furnace including the com- 35 center line of the nozzle 4. These arches have bination of a port, an up-anddowntake from open bottoms that face the up-and-down-take which said port opens, a fuel nozzle pointing and which are mainly in line therewith, and they through said port toward the hearth of said furconverge in the discharging direction of the noznace, and a plurality of conical arches that are zle4soasto form tandem inspirators which cause arranged in said port so that they are spaced 40 the flow of fuel to asperate into itself the air comfrom the walls and top of the latter and are cening from the up-and-down-take 3. Therefore, tered over the center line of said nozzle, said these arches provide a means for causing substanarches converging in the discharging direction of tial portions of the air and fuel to intermix before said nozzle and having open bottoms that face leaving theport 2, whereby an intense llame is said up-and-down-take and are at least mainly 45 obtained which is concentrated directly against in line therewith. "f Vthe surface of the bath. Since the majority of LOUIS C. EDGAR. 

